fix: 가오픈 설문 알림의 중복 갱신 유지

동일한 front status가 연속 도착해도 방금 열린 설문 알림을 즉시 닫지 않도록 cursor 처리를 멱등하게 만든다. production Chromium 회귀로 실시간 재조회 뒤 알림 유지를 검증한다.

app/game-frontend/e2e/mainNavigation.spec.ts

@@ -1158,6 +1158,7 @@ test('scopes the new-survey notice cursor to the reset-specific server ID', asyn
         generalMeCalls: 0,
         operations: [],
     };
+    await installRealtimeHarness(page);
     await installFixture(page, state);
     await page.addInitScript(() => {
         localStorage.setItem('state.che.lastVote', '99');
@@ -1170,6 +1171,14 @@ test('scopes the new-survey notice cursor to the reset-specific server ID', asyn
         .poll(() => page.evaluate(() => localStorage.getItem('state.che_260819_new_season.lastVote')))
         .toBe('1');
     expect(await page.evaluate(() => localStorage.getItem('state.che.lastVote'))).toBe('99');
+
+    await waitForMainRealtime(page);
+    const operationsBeforeDuplicate = state.operations.length;
+    await emitReadModelInvalidation(page, readModelInvalidation({ frontStatus: true }));
+    await expect
+        .poll(() => state.operations.slice(operationsBeforeDuplicate), { timeout: 3_000 })
+        .toEqual(['dashboard.getContextBundleDelta', 'general.getFrontStatus']);
+    await expect(page.locator('.survey-notice')).toContainText('새로운 설문조사가 있습니다.');
 });
 
 test('desktop menus preserve ref columns, prefix-safe routes, and controlled dropdown behavior', async ({

app/game-frontend/src/stores/mainDashboard.ts

@@ -306,7 +306,13 @@ export const useMainDashboardStore = defineStore('mainDashboard', () => {
         const storageKey = `state.${serverId}.lastVote`;
         const lastSeenVoteId = Number.parseInt(window.localStorage.getItem(storageKey) ?? '0', 10);
         if (latestVote.id <= (Number.isFinite(lastSeenVoteId) ? lastSeenVoteId : 0)) {
-            surveyNotice.value = null;
+            // Initial mounting, general creation and realtime invalidation can fetch
+            // the same front status in quick succession. The first response records
+            // the cursor; a duplicate response must not immediately dismiss the
+            // notice that response just opened.
+            if (surveyNotice.value?.id !== latestVote.id) {
+                surveyNotice.value = null;
+            }
             return;
         }
         window.localStorage.setItem(storageKey, latestVote.id.toString());